RequestFactory 接收数据

Question

我正在尝试使用 GWT RF 取回数据，但我遇到了一些麻烦。 这是我的工厂、代理和实体。

server.domain 包下的实体：

public class Job implements Serializable {
private int id;
private String announcer;
private String applied;
private String date;
private String description;
private String email;
private String title;
private int version;
static SessionFactory factory;
static ServiceRegistry serviceRegistry;
public Job() {
    try {
        Configuration configuration = new Configuration();
        configuration.configure();
        serviceRegistry = new ServiceRegistryBuilder().applySettings(
        configuration.getProperties()).buildServiceRegistry();
        factory = configuration.buildSessionFactory(serviceRegistry);
    }catch (Throwable ex) {
        System.err.println("Failed to create sessionFactory object." + ex);
        throw new ExceptionInInitializerError(ex);
    }
}
//Setters&Getters
public void persist() {
        Session session = factory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            Job job = this;
            session.save(job);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }
public static List<Job> findAllJobs() {
        Session session = factory.openSession();
        Transaction tx = null;
        List<Job> list = null;
        try {
            tx = session.beginTransaction();
            Query query = session.createQuery("select * from Job");
            list = query.list();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
        return list;
    }

JobRequest 类文件包含：

Request<List<JobProxy>> findAllJobs();

及入口模块：

final EventBus eventBus = new SimpleEventBus();
JobRequestFactory requestFactory = GWT.create(JobRequestFactory.class);
requestFactory.initialize(eventBus);
JobRequest request = requestFactory.jobRequest();
JobProxy newJob = request.create(JobProxy.class);
requestFactory.jobRequest().findAllJobs().to(new Receiver<List<JobProxy>>(){
public void onSuccess(List<JobProxy> jobs)
{
    System.out.println("SIZE:"+jobs.size());
}
}).fire();

最后我的错误是：

com.google.web.bindery.requestfactory.server.ServiceLayerDecorator die
SEVERE: No RequestContext for operation Lk3VEjMsjGdUyVzlgtz$ggTrjMA=

我不知道为什么会这样……

Answer 1

这通常意味着ValidationTool（或注释处理器）没有与最新版本的JobRequestFactory 一起运行，尤其是在JobRequest 不存在时运行它，JobRequestFactory 有没有返回 JobRequest 或 findAllJobs 的方法不存在或具有不同的签名（例如接受参数）。